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Results 4 comments of

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scroll event may prevent after use inside dataZoom

+1

When the size is right, there will be an extra blank page at the end

No. I manually deleted that page

crow::black_magic::const_str doesn't seem to be able to be used with const std::string types

```/* #define CROW_ROUTE(app, url) app.route(url) */``` *** std::string url ="/xxx"; app.route``(url.c_str())

不借助变量，交换两个数。

你借助了变量a和b